AR-15 Lower Receiver Parts Kit with RISE Armament RA-535 Drop-In Trigger (GZMS15LPK-RA535-2)

$ 292.95

Rise RA-140 Trigger

This lower receiver parts kit comes with everything you need to build and complete your stripped AR-15 lower receiver. All parts are made in the U.S.A. to meet or exceed standard military specifications. Kit includes the RA-535 APT Advanced Performance 3.5 lb pull drop in trigger by Rise Armament.

This kit includes all of the following:  

  • RISE Armament RA-535 Advanced Performance Trigger (APT) - 3.5 lb
  • KNS Anti-Rotation, Anti-Walk Pins
  • A2 Style Pistol Grip with Checkering, Deeply Grooved Back Strap and Finger Ledge
  • Flat Mil-Spec Trigger Guard
  • Steel Trigger Guard Roll Pin/Coil
  • Steel Takedown Pin - Nitride Finish
  • Steel Pivot Pin - Nitride Finish
  • Takedown/Pivot Pin Detent X2
  • Takedown/Pivot Pin Detent Spring X2
  • Steel Selector/Safety Switch - Nitride Finish
  • Selector/Safety Detent
  • Selector/Safety Detent Spring
  • Buffer Retaining Detent - Nitride Finish
  • Buffer Retaining Detent Spring
  • Steel Bolt Release - Nitride Finish
  • Steel Bolt Release Plunger - Nitride Finish
  • Bolt Release Plunger Spring
  • Steel Bolt Release Roll Pin/Coil
  • Steel Magazine Catch - Nitride Finish
  • Magazine Catch Spring
  • Steel Magazine Release Button - Nitride Finish

Why the RISE Armament RA-535 APT Advanced Performance Trigger Upgrade?

That's easy! The accuracy-enhancing RA-535 APT Advanced Performance Trigger uniquely combines smoothness and speed for a serious upgrade in performance. The first of its kind, the RA-535 APT is an outstanding premium trigger available at a great price!
The RA-535 is a high-performing, easy to install, easy to maintain, single-stage precision drop-in AR trigger making it the perfect replacement for gritty, heavy mil-spec AR triggers. Precision CNC machined in the United States from high-grade tool steel and aerospace grade aluminum according to strict AS9100 Aerospace requirements with all internal components finished in a slick, durable and self lubricating Fail Zero EXO nickel boron coating. The RA-535 features a 'Katana' style straight blade trigger for shooter comfort, a "glass break" clean break and very short reset. 
The self-contained design of the RA-535 makes it easy to install without the need for a gunsmith and with no fine-tuning needed. A great trigger is one of the best upgrades you can do to your AR style rifle or pistol and the Rise Armament RA-535 APT Advanced Performance Trigger is by far the best value drop-in performance trigger on the market today.
  • Single-stage
  • 3.5-lb. pull weight
  • Unit weight: 2.3 oz.
  • Quick reset for faster response time between shots
  • Lightened trigger pull with super-crisp release to improve accuracy and increase target acquisition
  • Combines straight trigger functionality and comfort with curved control
  • Self-contained design makes it easy and quick to install with no fine-tuning needed
  • Anti-rotation pins included
  • Fits most 308 and .223 AR style platforms
  • Manufactured and assembled in our facility according to strict AS9100 aerospace requirements, which are more stringent than standard gun manufacturing requirements
  • Quality-assured with high-tech inspection equipment that can measure up to five decimal places—two beyond the standard and far more precise than the human eye can detect
  • Precision CNC machined from high-grade, heat-treated tool steel and aluminum
  • Contained in RISE Armament’s signature bright red 8625 hardcoat anodized aluminum housing
  • To view installation instructions, watch tutorial here or read tutorial here
  • RISE Armament products are backed by a lifetime guarantee. If you have any issues with a RISE Armament product, please email RISE Customer Care at
  • The set screws in the housing should be used with any trigger pins
  • Note: The set screw should not be tampered with. Any attempts to modify the trigger will void the warranty.
  • U.S. Patent No. 7,293,385

    Want to know what separates Rise Armament from everyone else out there? Check out this interview by The Shooter's Mindset of Rise Armament's former President, and our friend, Chris Barger: